df66f4f6ba
* Use SysTick as OS tick timer * Use LPTIM2 as tickless idle timer * Remove dummy LPTIM2 IRQ handler * Clean up clock init code * Rename os timer to idle timer * Advance hal ticks along with FreeRTOS's * Improve SysTick control during tickless idle * Improve idle timer precision * Correct SysTick IRQ priority * Main, FuriHal: move system startup to separate thread * Minor code cleanup Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>
56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
#pragma once
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#include <stm32wbxx_ll_lptim.h>
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#include <stm32wbxx_ll_bus.h>
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#include <stm32wbxx_ll_rcc.h>
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#include <stdint.h>
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// Timer used for tickless idle
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#define FURI_HAL_IDLE_TIMER_MAX 0xFFFF
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#define FURI_HAL_IDLE_TIMER LPTIM2
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#define FURI_HAL_IDLE_TIMER_IRQ LPTIM2_IRQn
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static inline void furi_hal_idle_timer_init() {
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// Configure clock source
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LL_RCC_SetLPTIMClockSource(LL_RCC_LPTIM2_CLKSOURCE_LSE);
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// Set interrupt priority and enable them
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NVIC_SetPriority(
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FURI_HAL_IDLE_TIMER_IRQ, NVIC_EncodePriority(NVIC_GetPriorityGrouping(), 15, 0));
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NVIC_EnableIRQ(FURI_HAL_IDLE_TIMER_IRQ);
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}
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static inline void furi_hal_idle_timer_start(uint32_t count) {
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count--;
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// Enable timer
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LL_LPTIM_Enable(FURI_HAL_IDLE_TIMER);
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while(!LL_LPTIM_IsEnabled(FURI_HAL_IDLE_TIMER))
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;
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// Enable compare match interrupt
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LL_LPTIM_EnableIT_CMPM(FURI_HAL_IDLE_TIMER);
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// Set compare, autoreload and start counter
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// Include some marging to workaround ARRM behaviour
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LL_LPTIM_SetCompare(FURI_HAL_IDLE_TIMER, count - 3);
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LL_LPTIM_SetAutoReload(FURI_HAL_IDLE_TIMER, count);
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LL_LPTIM_StartCounter(FURI_HAL_IDLE_TIMER, LL_LPTIM_OPERATING_MODE_ONESHOT);
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}
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static inline void furi_hal_idle_timer_reset() {
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// Hard reset timer
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// THE ONLY RELIABLE WAY to stop it according to errata
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LL_LPTIM_DeInit(FURI_HAL_IDLE_TIMER);
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// Prevent IRQ handler call
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NVIC_ClearPendingIRQ(FURI_HAL_IDLE_TIMER_IRQ);
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}
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static inline uint32_t furi_hal_idle_timer_get_cnt() {
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uint32_t counter = LL_LPTIM_GetCounter(FURI_HAL_IDLE_TIMER);
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uint32_t counter_shadow = LL_LPTIM_GetCounter(FURI_HAL_IDLE_TIMER);
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while(counter != counter_shadow) {
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counter = counter_shadow;
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counter_shadow = LL_LPTIM_GetCounter(FURI_HAL_IDLE_TIMER);
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}
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return counter;
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}
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